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utils.ts - Utility functions and helpers for RankWatch\n\n// Standard API response interface\nexport interface ApiResponse {\n success: boolean;\n data?: T;\n error?: string;\n message?: string;\n meta?: {\n page?: number;\n limit?: number;\n total?: number;\n [key: string]: any;\n };\n}\n\n// Create standardized success response\nexport function createSuccessResponse(\n data: T,\n message?: string,\n meta?: any\n): Response {\n const response: ApiResponse = {\n success: true,\n data,\n ...(message && { message }),\n ...(meta && { meta }),\n };\n\n return new Response(JSON.stringify(response), {\n status: 200,\n headers: { \"Content-Type\": \"application/json\" },\n });\n}\n\n// Create standardized error response\nexport function createErrorResponse(\n error: string,\n status: number = 400,\n details?: any\n): Response {\n const response: ApiResponse = {\n success: false,\n error,\n ...(details && { details }),\n };\n\n return new Response(JSON.stringify(response), {\n status,\n headers: { \"Content-Type\": \"application/json\" },\n });\n}\n\n// Validate email format\nexport function isValidEmail(email: string): boolean {\n const emailRegex = /^[^\\s@]+@[^\\s@]+\\.[^\\s@]+$/;\n return emailRegex.test(email);\n}\n\n// Validate password strength\nexport function isValidPassword(password: string): { valid: boolean; message?: string } {\n if (password.length < 8) {\n return { valid: false, message: \"Password must be at least 8 characters long\" };\n }\n \n if (!/(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)/.test(password)) {\n return { \n valid: false, \n message: \"Password must contain at least one uppercase letter, one lowercase letter, and one number\" \n };\n }\n\n return { valid: true };\n}\n\n// Validate URL format\nexport function isValidUrl(url: string): boolean {\n try {\n new URL(url);\n return true;\n } catch {\n return false;\n }\n}\n\n// Validate keyword (basic validation)\nexport function isValidKeyword(keyword: string): { valid: boolean; message?: string } {\n if (!keyword || keyword.trim().length === 0) {\n return { valid: false, message: \"Keyword cannot be empty\" };\n }\n\n if (keyword.length > 255) {\n return { valid: false, message: \"Keyword must be less than 255 characters\" };\n }\n\n return { valid: true };\n}\n\n// Sanitize input string\nexport function sanitizeString(input: string): string {\n return input.trim().replace(/[<>]/g, \"\");\n}\n\n// Generate pagination metadata\nexport function createPaginationMeta(\n page: number,\n limit: number,\n total: number\n): { page: number; limit: number; total: number; totalPages: number; hasNext: boolean; hasPrev: boolean } {\n const totalPages = Math.ceil(total / limit);\n \n return {\n page,\n limit,\n total,\n totalPages,\n hasNext: page < totalPages,\n hasPrev: page > 1,\n };\n}\n\n// Parse query parameters for pagination\nexport function parsePaginationParams(url: URL): { page: number; limit: number } {\n const page = Math.max(1, parseInt(url.searchParams.get(\"page\") || \"1\"));\n const limit = Math.min(100, Math.max(1, parseInt(url.searchParams.get(\"limit\") || \"10\")));\n \n return { page, limit };\n}\n\n// Parse search query parameter\nexport function parseSearchQuery(url: URL): string {\n return url.searchParams.get(\"q\")?.trim() || \"\";\n}\n\n// Format date for API responses\nexport function formatDate(date: Date): string {\n return date.toISOString();\n}\n\n// Parse JSON body safely\nexport async function parseJsonBody(request: Request): Promise {\n try {\n const text = await request.text();\n if (!text) {\n throw new Error(\"Request body is empty\");\n }\n return JSON.parse(text);\n } catch (error) {\n throw new Error(\"Invalid JSON in request body\");\n }\n}\n\n// Validate required fields in object\nexport function validateRequiredFields(\n obj: any,\n requiredFields: string[]\n): { valid: boolean; missing?: string[] } {\n const missing: string[] = [];\n \n for (const field of requiredFields) {\n if (obj[field] === undefined || obj[field] === null || obj[field] === \"\") {\n missing.push(field);\n }\n }\n\n return {\n valid: missing.length === 0,\n ...(missing.length > 0 && { missing }),\n };\n}\n\n// Generate CSV from array of objects\nexport function arrayToCSV(data: any[], headers?: string[]): string {\n if (!data || data.length === 0) {\n return \"\";\n }\n\n const csvHeaders = headers || Object.keys(data[0]);\n const csvRows = [];\n\n // Add headers\n csvRows.push(csvHeaders.map(header => `\"${header}\"`).join(\",\"));\n\n // Add data rows\n for (const row of data) {\n const values = csvHeaders.map(header => {\n const value = row[header];\n if (value === null || value === undefined) {\n return '\"\"';\n }\n return `\"${String(value).replace(/\"/g, '\"\"')}\"`;\n });\n csvRows.push(values.join(\",\"));\n }\n\n return csvRows.join(\"\\n\");\n}\n\n// Sleep utility for delays\nexport function sleep(ms: number): Promise {\n return new Promise(resolve => setTimeout(resolve, ms));\n}\n\n// Retry function with exponential backoff\nexport async function retryWithBackoff(\n fn: () => Promise,\n maxRetries: number = 3,\n baseDelay: number = 1000\n): Promise {\n let lastError: Error;\n\n for (let attempt = 0; attempt <= maxRetries; attempt++) {\n try {\n return await fn();\n } catch (error) {\n lastError = error as Error;\n \n if (attempt === maxRetries) {\n break;\n }\n\n const delay = baseDelay * Math.pow(2, attempt);\n await sleep(delay);\n }\n }\n\n throw lastError!;\n}\n\n// Log request for debugging\nexport function logRequest(request: Request, userId?: number): void {\n const method = request.method;\n const url = new URL(request.url);\n const path = url.pathname;\n const timestamp = new Date().toISOString();\n \n console.log(`[${timestamp}] ${method} ${path} - User: ${userId || 'anonymous'}`);\n}\n\n// Soft delete timestamp\nexport function getSoftDeleteTimestamp(): string {\n return new Date().toISOString();\n}\n\n// Check if record is soft deleted\nexport function isSoftDeleted(deletedAt: string | null): boolean {\n return deletedAt !== null;\n}","deleted","label",[98],"permalink","https://www.val.town/x/diegoivo/denoCrudTask/code/utils.ts","extension","actionData","errors"]